A European summertime CO 2 biogenic flux inversion at mesoscale from continuous in situ mixing ratio measurements - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of Geophysical Research: Atmospheres Année : 2011

A European summertime CO 2 biogenic flux inversion at mesoscale from continuous in situ mixing ratio measurements

Résumé

[1] A regional variational inverse modeling system for the estimation of European biogenic CO 2 fluxes is presented. This system is based on a 50 km horizontal resolution configuration of a mesoscale atmospheric transport model and on the adjoint of its tracer transport code. It exploits hourly CO 2 in situ data from 15 CarboEurope-Integrated Project stations. Particular attention in the inversion setup is paid to characterizing the transport model error and to selecting the observations to be assimilated as a function of this error. Comparisons between simulations and data of CO 2 and 222 Rn concentrations indicate that the model errors should have a standard deviation which is less than 7 ppm when simulating the hourly variability of CO 2 at low altitude during the afternoon and evening or at high altitude at night. Synthetic data are used to estimate the uncertainty reduction for the fluxes using this inverse modeling system. The improvement brought by the inversion to the prior estimate of the fluxes for both the mean diurnal cycle and the monthly to synoptic variability in the fluxes and associated mixing ratios are checked against independent atmospheric data and eddy covariance flux measurements. Inverse modeling is conducted for summers 2002-2007 which should reduce the uncertainty in the biogenic fluxes by $60% during this period. The trend in the mean flux corrections between June and September is to increase the uptake of CO 2 by $12 gCm À2. Corrections at higher resolution are also diagnosed that reveal some limitations of the underlying prior model of the terrestrial biosphere. Citation: Broquet, G., F. Chevallier, P. Rayner, C. Aulagnier, I. Pison, M. Ramonet, M. Schmidt, A. T. Vermeulen, and P. Ciais (2011), A European summertime CO 2 biogenic flux inversion at mesoscale from continuous in situ mixing ratio measurements,
Fichier principal
Vignette du fichier
2011JD016202.pdf (1.43 Mo) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte
Loading...

Dates et versions

hal-02928921 , version 1 (08-09-2020)

Identifiants

Citer

Grégoire Broquet, Frédéric Chevallier, Peter Rayner, Celine Aulagnier, Isabelle Pison, et al.. A European summertime CO 2 biogenic flux inversion at mesoscale from continuous in situ mixing ratio measurements. Journal of Geophysical Research: Atmospheres, 2011, 116 (D23), pp.D23303 1-22. ⟨10.1029/2011JD016202⟩. ⟨hal-02928921⟩
38 Consultations
119 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More